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First study to test the reliability and validity of WIMU enclosed to a Smith’s machine bar in order to measure velocity in back squat. This study had two main goals. The first was to determine the reliability of the WIMU for mean velocity measurements during resistance exercises at 40% and 80% 1 repetition maximum (maximum weight you can lift with maximum effort in a single repetition). The second was to compare the results for the WIMU to a linear encoder (gold standard) for mean velocity measurements when clipped to the bar during back squat exercises using the Smith machine.

23 trained men aged 22.3 ± 3.2 years participated in this study. At maximum velocity in the concentric phase, they performed 10 repetitions with 40% 1 repetition maximum and eight repetitions with 80% 1 repetition maximum while using the WIMU and T-Force linear encoder simultaneously to record data.

In conclusion, the findings of this study suggest that WIMU is a reliable and valid tool for the assessment of mean velocity during the back squat exercise using the Smith machine. These findings could help coaches and sport researchers evaluate athletes performing resistance exercises similar to squats with a reliable, valid and portable tool.

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